/*
 * Copyright (c) 2022 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { BaseMatcher } from '../BaseMatcher.js';
/**
 * Is the value a number actually not a number (NaN)?
 */
export class IsNaN extends BaseMatcher {
    constructor() {
        super();
    }
    matches(item) {
        return Number.isNaN(item);
    }
    describeMismatch(item, mismatchDescription) {
        mismatchDescription.appendText("was ").appendValue(item);
    }
    describeTo(description) {
        description.appendText("a double value of NaN");
    }
    /**
       * Creates a matcher of {@link Double}s that matches when an examined double is not a number.
       * For example:
       * <pre>assertThat(Double.NaN, is(notANumber()))</pre>
       *
       * @return The matcher.
       */
    static notANumber() {
        return new IsNaN();
    }
}
